Detachable-aircraft-propeller, hur



3l in a direction to unscrevvV the same will positively Withdraw the hub from the shaft. Consequently, it'is an easy matter to dismount a propeller constructed and mounted as disclosed herein. The end of the nut may be formed with the apertures 34 for a cotter pin 35 which passes through the apertures and engages the slots l5 in the end of the shaft. t is apparent further that the propeller blades may 4be easily removed 'from the propeller huh, as it is merely necessary to unserew -the nuts 27 and pull oi the blades, the flange 24 of course being pulled v off together with the blades. 15

Although a specific construction has been described, it is to be understood that the invention is not limited to the exact details shown but includes changes and modiicztions which come within the scope ofthe appended claims Having thus described the invention what is claimed as new and desired to he secured by Letters Patent is:

l. ln an aircraft construction in combi-- nation, a driving shaft, a propeller having;r a hub mounted on said shaft, one of said parts at the inner end of the huh havingr axially projecting lugs adapted to engage in recesses in the other part, and means at the outer end of the huh to secure the hub against axial movement on the shaft.

2. in an aircraft construction, in combination a driving shaft havingr a pair of circnnil'erentially spaced radially projecting lugs, a propeller hub mounted on said shaft having an axial projection at one end disposed .between said lugs and means on the shaft coacting with the opposite end of said hub to force the hub toward said lugs.

3. In an aircraft construction, in combi- 40 nation, a driving shafthaving a conical end portion and a pair ot." circumferentially. spaced radially projecting' lugs at the base of said portion, a hub on said portion having a projection at one end disposed between said lugs,-a nut at the other end having two threaded parts of different pitch, one oi' said parts being associated with ,f1 threaded por-l tion on the hub, and the other with a threaded portion on the shaft, whereby rota.- tion of the nut forces the hub along the shaft.

4. In an aircraft construe-tion`v in combination, a drivingshaftn a propeller having' a hub mounted. on said shalt, one oisaid parts at the inner end of the hub havin; axially projecting lugs adapted to engage in rccesses in the other part7 said shaft projecting from the outer end of 'the huh and hav ing its end portion threaded, and the .outer end of the huh portion also being threaded, the pitch oi the hub thread btinzgr less than the pitch ot the shaft thread, and a not having two threaded parts each adapted to cooperate with one ot the' threaded parts of 65 the hub and shaft to torce the huh to its seat on the shaft or withdraw it therefrom, and means to lock the nut against rotation relative to said parts.

In testimony whereof l alix my signature,

JESSE G. VINCENT. 

